http://bitsavers.trailing-edge.com/pdf/dec/pdp11/handbooks/EB-24944-18_Micro_PDP-11_Handbook_1983-84.pdf
p.395

ODT commands allow you to access memory and registers, run diag-
nostics, and monitor the system. 

            Table 1-1 Console ODT Commands*
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Command                   Symbol     Description 
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Slash                     /          Prints the contents of a specified 
                                     location 
Carriage return           <CR>       Closes an open location 
Line feed                 <LF>       Closes an open location and 
                                     then opens the next contiguous 
                                     location 
Internal register desig-  $ or R     Opens a  specific processor reg-
nator                                ister 
Processor status          S          Opens the PS, must follow a "$" 
word designator                      or "R" command 
Go                        G          Starts program execution 
Proceed                   P          Resumes execution of a pro-
                                     gram 
Binary dump        Control-Shift-S   Manufacturing use only
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* On the F-11-based MICRO/pDP-11, all addresses in ODT must be 
18-bit addresses between 0 and 777776(8).